gcc/ada/s-imgenu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ E N U M                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --            Copyright (C) 2000 Free Software Foundation, Inc.             --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with Unchecked_Conversion;
  36
  37 package body System.Img_Enum is
  38
  39    -------------------------
  40    -- Image_Enumeration_8 --
  41    -------------------------
  42
  43    function Image_Enumeration_8
  44      (Pos     : Natural;
  45       Names   : String;
  46       Indexes : System.Address)
  47       return    String
  48    is
  49       type Natural_8 is range 0 .. 2 ** 7 - 1;
  50       type Index_Table is array (Natural) of Natural_8;
  51       type Index_Table_Ptr is access Index_Table;
  52
  53       function To_Index_Table_Ptr is
  54         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  55
  56       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  57
  58       Start : Natural := Natural (IndexesT (Pos));
  59       Next  : Natural := Natural (IndexesT (Pos + 1));
  60
  61       subtype Result_Type is String (1 .. Next - Start);
  62       --  We need this result type to force the result to have the
  63       --  required lower bound of 1, rather than the slice bounds.
  64
  65    begin
  66       return Result_Type (Names (Start .. Next - 1));
  67    end Image_Enumeration_8;
  68
  69    --------------------------
  70    -- Image_Enumeration_16 --
  71    --------------------------
  72
  73    function Image_Enumeration_16
  74      (Pos     : Natural;
  75       Names   : String;
  76       Indexes : System.Address)
  77       return    String
  78    is
  79       type Natural_16 is range 0 .. 2 ** 15 - 1;
  80       type Index_Table is array (Natural) of Natural_16;
  81       type Index_Table_Ptr is access Index_Table;
  82
  83       function To_Index_Table_Ptr is
  84         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  85
  86       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  87
  88       Start : Natural := Natural (IndexesT (Pos));
  89       Next  : Natural := Natural (IndexesT (Pos + 1));
  90
  91       subtype Result_Type is String (1 .. Next - Start);
  92       --  We need this result type to force the result to have the
  93       --  required lower bound of 1, rather than the slice bounds.
  94
  95    begin
  96       return Result_Type (Names (Start .. Next - 1));
  97    end Image_Enumeration_16;
  98
  99    --------------------------
 100    -- Image_Enumeration_32 --
 101    --------------------------
 102
 103    function Image_Enumeration_32
 104      (Pos     : Natural;
 105       Names   : String;
 106       Indexes : System.Address)
 107       return    String
 108    is
 109       type Natural_32 is range 0 .. 2 ** 31 - 1;
 110       type Index_Table is array (Natural) of Natural_32;
 111       type Index_Table_Ptr is access Index_Table;
 112
 113       function To_Index_Table_Ptr is
 114         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
 115
 116       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 117
 118       Start : Natural := Natural (IndexesT (Pos));
 119       Next  : Natural := Natural (IndexesT (Pos + 1));
 120
 121       subtype Result_Type is String (1 .. Next - Start);
 122       --  We need this result type to force the result to have the
 123       --  required lower bound of 1, rather than the slice bounds.
 124
 125    begin
 126       return Result_Type (Names (Start .. Next - 1));
 127    end Image_Enumeration_32;
 128
 129 end System.Img_Enum;